and it's also difficult for us to build an enterprise around too small a number. so we're very concerned about a pursuit of a local number. >> let's go to the b61, nuclear gravity bomb. it is now being modernized. there are those who look at the costs. som estimates have it as high as $16 billion. why is the b61, as well as so many other nuclear programs costing so much money? what is the challenge in this revitalization. >> these are complex, and high- tech weapons. contrary to every other military capability we produce, this has to stand the scrutiny of nuclear assurety standards. we must be able to prevent an accidental launch, and it must only be deployed, and executed when we have proper authority from the president. those are two very high standards. so the surety things that must go into that weapon are at an exponentially higher level. the b51 itself is, has thousands of components. when you change out a few of them, you have to make sure that they all work together properly. and you also have to, once you get in there, upgrade those that date back to the